Jetboat LS2000 won't rev up it's crazy

Hi

My name is Roman from Luxemburg/Europe and I need a miracle soon otherwise the LS gonna burn soon.

After I bought the boat i realized that I could start barely start the engines but till i give trottle they died bad idle and smoke like hell ( I bought it from Ebay in Florida
and I only saw it by picturescI trusted the seller - I was too stupid).
The engines were the same than installed in Waverunner GP1200

I the checked several things to figure out the problem (i have the workshop manuel)

Compression ratio on both engines - ok
Changed the plugs
Checked fuellines filters - ok
Rebuild the carbs with mikunikits
Checked the coils
Checked the Reedvalves
Replaced the CDI unit (even swapped the new one from one engine to the other )
Checked the Temp sensor - ok

What i noticed is that the oil pumps were removed and SBT engines tab been installed .
Please if somebody has a clue let me know

Both engines almost same problem, one starts ok but bad idle the other i couldn't barely get started.
When I try to give trottle the engine dies
Premix ratio is fine.
What did you think about srewed up crankshaft seals could this cause this sort of problem? Bad idle,smoke .
Roman
By the way is the GP1200R almost the same engine carbs electronic etc exept the power valve or am I wrong

Something I tried too to figure out if I have a fuel problem I tried to spray startpilot into the carbs so I have Startpilot fulltrottle ignition an compression the engine should rev up even for e few seconds
I'am not a specialist in 2 stroke engines especially not 3cylinder ones.

yes impellers free
since I have the boat they run bad ,I have no history or contact to the previous owner.
Thats why ist so hartd to find out , if at least one engine yould run so i could swap.
I think plan B is to buy a GP1200 with good engine and swap parts step by step

I will do pressure testing and I'm looking for a GP1200
at least in can ride this season.Anothet Yam in my garage
the only thing that i didnt like is the fact that I can't see this
1200 engine anymore after all and now i gonna buy a 3 one.
Its crazy